Captain Underpants and The Perilous Plot of Professor Poopypants - Characters - Main

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• George Beard and Harold Hutchins - Two 4th grade pranksters, who are best friends and next-door neighbors. They started a comic book company called "Treehouse Comix Inc.," and every so often at school they go to the secretary's office to make copies of their latest comic book and sell them on the playground. George is identified by his tie and flat top haircut, while Harold is recognizable by his T-shirt and bad haircut, a gag that always starts every book. George is 9¾ years old while Harold is 10 years old, identified in the Super Diaper Baby book. They are considered the class clowns of 4th grade at Jerome Horwitz Elementary School, a school which discourages imagination and fun (Ironically,Jerome Horwitz is the birth name of Curly Howard of the Three Stooges). It is revealed in the Wrath of the Wicked Wedgie Woman that they perform fairly well overall in school, as their grades range from B to C. They often get in trouble with Mr. Krupp.

• Principal Benny Krupp - The mean and evil principal of Jerome Horwitz Elementary School and the main antagonist. Mr. Krupp has a very deep hatred of children, and also tries to protect Jerome Horwitz Elementary from George and Harold's antics. Why he is so mean to children in general is unknown. In the first book, he gets hypnotized by George and Harold for being so mean to them and becomes the superhero Captain Underpants, with a flaw in their attempt to return him to normal resulting in him alternating between Captain Underpants and Mr. Krupp whenever someone snaps their fingers (As Mr. Krupp) and pours water over his head (Captain Underpants). He does not know of his superhero identity, though in the ninth book it's revealed that he does know of the real Captain Underpants's existence. His first name is revealed as "Benny" in "Captain Underpants and the Perilous Plot of Professor Poopypants" and his favorite book from his childhood is revealed as "How the Grinch Stole Christmas!" (with the last seven pages torn out of the book) in "Super Diaper Baby 2". "Benny Krupp" is a bad pun on the word "bankrupt."

• Captain Underpants - The alter ego of Mr. Krupp, when he is hypnotized to think he is "Captain Underpants," a character created by George and Harold. He always wears underpants and a red cape with black polka-dots. Whenever Mr. Krupp hears the sound of fingers snapping, he turns into Captain Underpants, and turns back into Mr. Krupp when water is poured on his head. Originally, he did not have any real superpowers (even though he believed he did), so George and Harold would have to follow Mr. Krupp every time he transformed into Captain Underpants to make sure he did not get hurt. He gained his superpowers in the third book by drinking some "Extra Strength Super Power Juice" found on an alien spaceship. Captain Underpants is considered to be the 'light side' of Mr. Krupp himself, as he is nice and kind to everyone, especially children.

• Sulu and Crackers - George and Harold's pets. Sulu was Melvin's abandoned pet bionic hamster after he yelled at Sulu which offended him, but afterward was adopted by George and Harold. Crackers is their pet Quetzalcoatlus they got when they traveled back in time with Melvin Sneedly's time machine. Sulu first appeared in The Big, Bad Battle of the Bionic Booger Boy, Part 1. Crackers first appeared in The Big, Bad Battle of the Bionic Booger Boy, Part 2. Sulu was briefly a villain after being hypnotized by Evil George and Evil Harold in The Preposterous Plight of the Purple Potty People. Crackers was hypnotized as well, but did not turn evil because he was a female, and as shown in Captain Underpants and the Wrath of the Wicked Wedgie Woman, hypnosis does the opposite effect for women than what the hypnotizer says (Crackers was in an alternate universe at the time, but the hypnosis ring came from the original universe).

• Melvin Sneedly - George and Harold's nerdy nemesis. He is an annoying snitch, mechanical genius, the school brainiac, and tattletale. He was first introduced in the book Captain Underpants and the Attack of the Talking Toilets, where he invents the "PATSY-2000" for the science fair. In book 4, he has a silly name, "Pinky Pizzabrains". He is described as "the kid with the bowtie and the eyeglasses". He becomes the main villain of book 6, Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy Part 1: The Night of the Nasty Nostril Nuggets, after accidentally transforming himself into the Bionic Booger Boy. In "Revenge of the Ridiculous Robo-Boogers", Melvin switches bodies with Mr. Krupp and gains his powers, but loses them once they are given back to Captain Underpants. In "Purple Potty People," the alternate Melvin was not at all intelligent. In book 7, at the end he was chased because of the trouble he caused. In book 9 on the front of news paper it says 'Melvin spoke about George and Harold in court but Melvin does not appear in the book.